Vulnerability in Prefecthq Prefect
CVE-2026-7724
A vulnerability has been found in PrefectHQ prefect up to 3.6.28.dev1. Affected by this vulnerability is the function validate_restricted_url of the component Webhook/Notification. The manipulation leads to time-of-check time-of-use. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.6.28.dev2 addresses this issue. The identifier of the patch is 7c70ac54a5e101431d83b9f2681ec88d5e0021ed. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (21.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Prefecthq Prefect — versions 3.6.28.dev1, 3.6.28.dev2
Weakness classification (CWE)
References
- vuldb.com/vuln/360900 (technical-description, vdb-entry)
- vuldb.com/vuln/360900/cti (signature, permissions-required)
- vuldb.com/submit/807303 (third-party-advisory)
- linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-r… (issue-tracking)
- github.com/PrefectHQ/prefect/pull/21591 (issue-tracking, patch)
- gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a (exploit)
- github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed (patch)
- github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 (patch)
- github.com/PrefectHQ/prefect/ (product)
Frequently asked questions
- What is CVE-2026-7724?
- CVE-2026-7724 is a medium-severity vulnerability in Prefecthq Prefect, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.0/10. Published 2026-05-04.
- How severe is CVE-2026-7724?
- Medium severity. CVSS v3 base score is 5.0 out of 10.